suricata/bpf: fix -Wshorten-64-to-32 warning

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/
https://redmine.openinfosecfoundation.org/issues/7366
https://redmine.openinfosecfoundation.org/issues/6186

Describe changes:

• suricata/bpf: fix -Wshorten-64-to-32 warning

Next "batch" after #11958 with one dedicated ticket

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.37%. Comparing base (b1e7917) to head (53a76ed).
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12086      +/-   ##
==========================================
- Coverage   83.37%   83.37%   -0.01%     
==========================================
  Files         910      910              
  Lines      257556   257556              
==========================================
- Hits       214748   214734      -14     
- Misses      42808    42822      +14     

Flag	Coverage Δ
fuzzcorpus	61.54% <0.00%> (+<0.01%)	⬆️
livemode	19.41% <0.00%> (-0.01%)	⬇️
pcap	44.46% <0.00%> (-0.04%)	⬇️
suricata-verify	62.78% <0.00%> (+0.02%)	⬆️
unittests	59.36% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[suricata-qa]

Information: QA ran without warnings.

Pipeline 23249

[victorjulien]

Merged in #12088, thanks!